Telegram bot failing to send PDF files

Other Questions Telegram bot
1

Help! My Telegram bot can’t send PDFs

I’m having trouble with my Telegram bot. When I try to send a PDF file, I get this error:

aiogram.exceptions.TelegramBadRequest: Telegram server says - Bad Request: failed to get HTTP URL content

I’ve tried using message.answer_document('file.pdf'), but it’s not working. Here’s a snippet of my code:

@start_router.message(F.photo)
async def handle_photo(message: Message, bot: Bot):
    # Process photo and generate PDF
    # ...
    
    await message.answer_document('file.pdf')
    
    # Clean up files
    # ...

Any ideas on what I’m doing wrong? How can I fix this so my bot can send PDFs successfully?

2

I’ve dealt with this exact issue before, and it can be frustrating. One thing that worked for me was using BytesIO to handle the PDF in memory instead of relying on file paths. Here’s what I did:

from io import BytesIO

# After generating your PDF
pdf_buffer = BytesIO()
# Save your PDF to pdf_buffer instead of a file

# Then send it like this
await message.answer_document(BufferedInputFile(pdf_buffer.getvalue(), filename='document.pdf'))

This approach bypasses file system issues and permissions problems. It’s also faster since you’re not writing to disk. Just make sure you’re actually generating the PDF correctly before trying to send it. If you’re still having trouble, double-check your bot token and make sure you have the right permissions in your chat.

3

I encountered a similar issue with my Telegram bot. The problem might be related to how you’re specifying the file path. Instead of using a relative path, try providing the absolute path to the PDF file. Additionally, ensure you have the necessary permissions to access the file.

Another approach is to use the ‘FSInputFile’ class from aiogram. It’s designed to handle local files more effectively. Here’s how you can modify your code:

from aiogram.types import FSInputFile

# ...

pdf_path = '/path/to/your/file.pdf'
pdf_file = FSInputFile(pdf_path)
await message.answer_document(pdf_file)

This method has worked reliably for me when sending PDFs through Telegram bots. Let me know if this resolves your issue.

4

hey there! have u tried using the full file path instead of just the filename? sometimes that can cause issues. also, make sure the PDF actually exists and is readable. u could try opening the file first to verify it’s there before sending. hope that helps!